Решим по действиям:
1) 2/(m - 2) - 8/(m² - 4) = 2/(m - 2) - 8/(m - 2)(m + 2) = 2(m + 2)/(m - 2)(m + 2) -
8/(m - 2)(m + 2) = (2m + 4 - 8)/(m - 2)(m + 2) = (2m - 4)/(m - 2)(m + 2) =
2(m - 2)/(m - 2)(m + 2) = 2/(m + 2)
2) 2/(m + 2) - 1/(m + 2) = 1/(m + 2)
3) 1/(m + 2)·(m² + 4m + 4) = (m + 2)²/(m + 2) = m + 2
Ответ: m + 2.
(85^3+31^3/116-85*31)=611746,818966<span>
</span>(45^2-9^2)=1944
(85^3+31^3/116-85*31)/(45^2-9^2)=<span>314,684577657
вроде так
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7/5*2/1= 2 4/5
2/3*7/2=2 1/3